Error code 21F900 on the BMW S1000R 2014 refers to a fault in the ABS pressure sensor. The sensor is located in the ABS hydraulic unit and measures the brake fluid pressure in the hydraulic system.
If you are experiencing this error code, it is recommended that you take your motorcycle to a certified BMW technician to diagnose and repair the issue. They may need to inspect the ABS hydraulic unit and pressure sensor to determine the cause of the fault and replace any damaged components as necessary. It is important to address any ABS faults as soon as possible, as they can affect the safety and performance of your motorcycle.
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